Bicycle frame



FIG. 1 is a front, left-side perspective view of the bicycle frame;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left-side elevational view thereof, the right-side elevational view thereof (not shown) being a mirror image of the left-side elevational view;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof.

The broken lines in the drawings illustrate portions of the bicycle frame that form no part of the claimed design. 

CLAIM The ornamental design for a bicycle frame, as shown and described. 